Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e58e9b487b6d6…

MALICIOUS

PDF

40.1 KB Created: 2020-08-20 05:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d425cf154b4c9a79e135198ae86493f1 SHA-1: 95f8596785c81ffd3631f5c5ecd47c24123b360a SHA-256: f52e58e9b487b6d64b4eafa9dddef60e7a26665e8d52521739f38be76041e4d5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=android+eraser+free'. This link is presented within the document body, likely as a lure for users to download or access malicious content. The presence of numerous other embedded links, many hosted on cdn.shopify.com, suggests a link farm or distribution mechanism for further payloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=android+eraser+free
    • http://besojit.destinationyoga.net/uploads/1/3/1/4/131409090/pepep.pdf
    • http://files.stanmorebowls.com/uploads/1/3/1/4/131408942/6d6168.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/16480866138.pdf
    • https://cdn.shopify.com/s/files/1/0434/6288/5541/files/xolewinujiraje.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/algorithm_complexity_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/96759979546.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/bapejasumaduz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/sefojadiwusovasiloketi.pdf
    • https://cdn.shopify.com/s/files/1/0459/9260/7901/files/hppsc_hpas_answer_key_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/45585297034.pdf
    • https://cdn.shopify.com/s/files/1/0439/0486/0328/files/celebrity_rehab_presents_sober_house.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3784/files/la_invencin_de_morel_adolfo_bioy_casares.pdf
    • https://cdn.shopify.com/s/files/1/0430/6980/0597/files/69035824070.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d7.bin
18216ffe3e00932e17e43f61e16843137ee2f1df79cc79fe6f87d804944762ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D7 4856 bytes
font_01_sfnt_off00007264.bin
9c15f6453f264105b3ab421d78ccfc70a7b644d69c00f92b617739ea82549416
pdf-font-stream PDF embedded font (sfnt) at offset 0x7264 9900 bytes